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Hadamard Long‐Range Proton–Carbon Coupling Constant Measurements with Pulsed Field Gradients
Author(s) -
Nishida T.,
Widmalm G.,
Sándor P.
Publication year - 1996
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199605)34:5<377::aid-omr893>3.0.co;2-u
Subject(s) - hadamard transform , chemistry , excitation , coupling constant , pulse sequence , pulse (music) , coupling (piping) , spectral line , range (aeronautics) , transformation (genetics) , field (mathematics) , nuclear magnetic resonance , analytical chemistry (journal) , optics , physics , materials science , quantum mechanics , mathematics , biochemistry , chromatography , detector , pure mathematics , metallurgy , composite material , gene
Sources of artifacts in Hadamard spectra were investigated and identified as insufficient suppression of signals from solvent, protons attached to 12 C atoms and error signals caused by non‐ideal excitation and the subsequent Hadamard transformation. Pulsed field gradients (PFG) effectively eliminate the former error signals while re‐optimized Hadamard‐shaped pulses produce practically ideal excitation and Hadamard transformation affords artifact‐free spectra. Long‐range 13 C– 1 H coupling constants of 1,6‐anhydro‐β‐D‐galactopyranoside and 3‐acetylpyridine were determined by using a PFG pulse sequence and re‐optimized Hadamard‐8 shaped pulses.